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6.7x-6.7=40.2
We move all terms to the left:
6.7x-6.7-(40.2)=0
We add all the numbers together, and all the variables
6.7x-46.9=0
We move all terms containing x to the left, all other terms to the right
6.7x=46.9
x=46.9/6.7
x=7
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